Objective To understand the detection effect of internal carotid artery ultrasound combined with transcranial Doppler on patients with postpartum depression, and to provide valuable clues for clinical postpartum depression treatment. Methods The data of 78 parturients who met the diagnostic criteria for depression in our hospital from March 2018 to February 2020 were collected. The data were reviewed and set as the study group. At the same time, 78 healthy parturients were selected as the control group.We used internal carotid artery ultrasound to detect the carotid blood flow parameters [carotid artery diameter (D), peak systolic velocity (PSV), end diastolic velocity (EDV) and resistance index (RI)] of the two groups of parturients, and combined transcranial color Doppler ultrasound (TCD) to monitor the blood flow velocity of the arteries and vertebrobasilar artery (VA-BA), middle cerebral artery (MCA), anterior cerebral artery (ACA) and posterior cerebral artery (PCA) of the two groups of women. The changes in maternal RI and PI between the two groups were analyzed, and the above data were statistically analyzed and compared between groups. Results Compared with the control group, the D and EDV levels of the study group were decreased, while the RI value was increased, the difference was statistically significant (P<0.05). The comparison of PSV between the two groups was not statistically significant (P>0.05). The arterial blood flow velocity in MCA, ACA, and PCA of the depressed women in the study group were accelerated and the differences were statistically significant (P<0.05). The blood flow velocity of VA-BA of the depressed women in the study group was slower than that of the control group, and the difference was statistically significant (P＜0.05). RI and PI values of depressed women in the study group were compared with those of the control group. There was no statistically significant difference between the groups (P>0.05). Among 78 depressed women, 62 had abnormal cerebral artery blood flow. The abnormal detection rate was 79.49% (62/78). Conclusion Transcranial Doppler examination showed that the blood flow of the three cerebral arteries of the postpartum depressed women was increased, while the blood flow of the vertebrobasilar arteries slowed down, which indicated that the depressed women had cerebral artery spasm and the cerebral blood supply was obviously insufficient. The internal carotid artery ultrasound showed there were certain changes in carotid blood flow parameters of depressed mothers, which can provide a certain reference for the treatment of patients with postpartum depression.